Impregnation resins and varnishes

Solvent-based varnishes become less and less popular due to their solvent content and organic emission consequences. Nevertheless, due to their excellent stability in tanks, their versatile process ability and usually good technical performances, they will remain important in the future.

The main advantages of solvent-based varnishes are:

  • Easy to process
  • Outstanding stability
  • Highly versatile for any kind of machines (motors, generators, transformers)
  • Good resin film build- excellent general technical properties
Impregnation dipping

Solventless resins are very reactive resins with monomers which could be considered as VOC (Volatile organic compounds). They show outstanding reactivity compared to varnishes, keeping low viscosity specification which allows very quick penetration and draining. There's nothing better at this stage which could compete in term of high productivity with minimized process cost. The organic emision could be strongly minimized according to process choice.

The main advantages of solventless varnishes are:

  • Room temperature impregnation
  • Excellent stability at room temperature
  • Very high reactivity
  • Adaptablle on any kind of impregnation process and machines
  • High resin film build and slot fill
  • Outstanding technical properties
Impregnation trickling

Solvent free resins have been developped during the past 15 years under European environment regulations pressure in order to strongly minimize the global organic emission (IEC 1999/13 CE) level. Many progress have been made and are always ongoing in order to minimize the VOC (Volatile Organic Compounds) resin content on one hand, and also eliminate any toxicological risks for the workers and the environment. The solent-free resins range is growing quickly and strongly with monomer-free resin solutions or containing reactive monomers / oligomers which are green & safe and not considered as volatile. Due to usual higher viscosity and a bit lower reactivity than Solvent less resins, they usually are less versatile and should be used on well optimized processes and impregnating equipments.

The main advantages of solvent-free varnishes are:

  • Excellent tank stability even at high temperature
  • No VOC (Volatile Organic Compound)
  • Low emission during curing
  • Green labels
  • Outstanding technical properties
Roll through impregnation

Von Roll and Dolph’s varnishes and resins are integral components of insulating systems forall classes of rotating equipment, motors and generators. These materials provide environmental protection, vibration reduction and, in some cases, additional dielectric strength. The choice of the right material depends on the end-use application.

The product range of water-borne varnishes is the result of a dedicated team with worldwide experience, true concern for the environment, and substantial safety and technical expertise. A representative solution is our Aqua-Therm® product range, which includes the following attractive features:

  • Easy and safe use
  • Low environmental impact
  • Excellent impregnability
  • Outstanding bonding properties
  • Good overall protection
  • High cost-effectiveness
Water based resins